stricter compiler warnings on Debug builds
stricter compiler warnings on Debug builds

Change-Id: I0736b8da270bcb74dbcfa2e2dd198ed4cf280b62

jinxuan/forestdb,sushmaad/forestdb,jinxuan/forestdb,joliss/forestdb,hisundar/forestdb,zhaog/forestdb,yyangpan/forestdb,wurikiji/forestdb,yyangpan/forestdb,sushmaad/forestdb,wurikiji/forestdb,hisundar/forestdb,zhaog/forestdb,couchbase/forestdb,couchbase/forestdb,joliss/forestdb